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関連する概念動画

Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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pH01:24

pH

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The potential of hydrogen (pH) is a measure of the acidity or basicity of a water-based solution determined by the concentration of hydronium ions (H3O+). In one liter of pure water at neutral pH, there are 1×10−7 moles of hydronium ions. However, the extensive range of hydronium ion concentrations present in water-based solutions makes measuring pH in moles cumbersome. Therefore, a pH scale was developed to convert moles of hydronium ions into the negative logarithm of the hydronium...
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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
141
Production of Organic Acids01:25

Production of Organic Acids

105
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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デュアルカルバイドヘテロ構造 インターフェース駆動 広範囲のpHの水素燃料生産

Disha Sonwani1, Bhojkumar Nayak1, Neeraj Mishra2

  • 1Department of Chemistry, Indian Institute of Science Education and Research, Pune, Dr. Homi Bhabha Road, Pune- 411008, India.

Langmuir : the ACS journal of surfaces and colloids
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PubMed
まとめ
この要約は機械生成です。

研究者は効率的な水素生成のための新しい二酸化炭素ヘテロ構造触媒を開発しました. この高度な電気触媒は,すべてのpHレベルにおいて優れた性能を示し,持続可能なエネルギーソリューションのためにプラチナに費用対効果の高い安定した代替品を提供します.

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科学分野:

  • 材料科学
  • 電気化学
  • カタリシス

背景:

  • 持続可能な水素生産は 炭素中立の未来に不可欠です
  • 水素進化反応 (HER) には,効率的で費用対効果の高い電気触媒が必要である.
  • 現在の触媒は,異なるpH環境で安定性や性能の制限に直面することが多い.

研究 の 目的:

  • 幅広いpH範囲で高いHER性能を持つ新しい電気触媒を開発する.
  • 触媒活動の強化におけるインターフェースエンジニアリングの役割を調査する.
  • 高価な金属の触媒に 費用対効果の高い安定した代替手段を 示すこと

主な方法:

  • デュアルカーバイドヘテロ構造の触媒の合成
  • 酸性,中性,およびアルカリ性電解質での触媒の電気化学試験.
  • 反応エネルギーと電子構造を分析するための密度関数理論 (DFT) の計算.
  • 塩水電解機での長期安定性試験

主要な成果:

  • デュアルカーバイドヘテロ構造の触媒は,プラチナに匹敵する低超電位で例外的なHER性能を示した.
  • 触媒は,テストされたすべてのpH範囲 (pH-ユニバーサル) で著しい安定性と活性を示した.
  • DFT計算は,ヘテロインターフェイスでのシナージ効果により,最適化された水素吸収/脱吸収エネルギー (ΔGH* ≈ 0.34 eV) を確認した.
  • 触媒は塩水電解剤で200時間持続し,分解しませんでした.

結論:

  • デュアルカーバイドヘテロ構造のインタフェースエンジニアリングは,高度なHER電触媒のための有望な戦略です.
  • 開発された触媒は,持続可能な水素生産のための費用対効果の高い,安定した,高性能のソリューションを提供します.
  • この研究は,貴金属に匹敵する非貴金属触媒の利用の道を開きます.